Statistics – Applications
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2973l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 11, pp.2973-2983
Statistics
Applications
Scientific paper
A new preparative pyrolysis technique enabling the recovery and fractionation (into saturated hydrocarbons, unsaturated hydrocarbons, and aromatic hydrocarbons) of the total C 6+ hydrocarbon fraction (instead of the C 13+ fraction usually recovered) has been applied to different types of source-rocks. The composition of the C 7 -C 13 hydrocarbon fraction in the pyrolysate, particularly the amount of aromatic hydrocarbons as compared to alkanes, was found to be characteristic of each type of kerogen, with the alkane / aromatic ratio consistently decreasing in the progression from Type I to Type III kerogens. While the C 13+ fraction is useful in kerogen typing, it was found that the C 7 -C 13 hydrocarbon fraction, which represents 40 to 50% of the total recovered pyrolysate, was the most signficant in emphasizing differences between kerogen types, allowing a rapid and precise estimation of the source-rock type. This new technique was applied to potential source-rocks of the Viking Graben, North Sea (Draupne formation, Heather formation, Brent coals, and Dunlin group). In each case, the pyrolysates allowed us to determine whether the organic matter was Type II, Type III, or a mixture of both. Pyrolysis of asphaltenes from crude oils from the various regions was conducted and potential applications of our technique to studies of oil/source-rock correlations were examined.
Behar Françoise
Lafargue E.
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